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US20090021238A1 OPTICAL DEVICE AND METHOD OF CONTROLLING THE SAME 有权
光学装置及其控制方法

OPTICAL DEVICE AND METHOD OF CONTROLLING THE SAME
摘要:
An optical device includes an optical element, a detector and a controller. The optical element has an optical waveguide. Refractive index of the optical waveguide is controlled by a heater. A temperature of the optical element is controlled by a temperature control device. The detector detects a current flowing in the heater and/or a voltage applied to the heater. The controller controls an electrical power provided to the heater so as to be kept constant according to the detection result of the detector.
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